Southampton: Plus One ADU Program 
ADUs can help stabilize housing expenses or safely house a family member nearby
Accessory Dwelling Units (ADUs), also known as accessory apartments, are secondary housing units on a single-family residential lot.
The Plus One ADU program may provide up to $125,000 in grant funding to support low-and middle-income single family homeowner occupants who wish to:
Build a new accessory dwelling unit on their property OR
Improve an existing ADU that needs to be brought into compliance with code requirements.
PROGRAM FEATURES
- ADU design and permitting
- Project budgeting
- Environmental site clearance
- Contractor selection &scoping
- Construction oversight
- Post Construction Monitoring
AN ADU MAY BE
- Small, attached or detached/stand- alone units on a single family lot
- Basement apartments
- Garage conversions
AN ADU MAYNOT BE
- Used for Short Term or Vacation Rentals
- Outside of the Town of Southampton
CONTACT US
(631)-364-5646
EMAIL: PLUSONEADU@CDCLI.ORG
WWW.CDCLI.ORG
